Information Technology Reference
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Resources
where he outlines an ontology of types of resources conditioned by
how the resource varies over HTTP requests (Berners-Lee 1996a). Berners-Lee has
informally said that a
generic resource
is equivalent to information resources, since
the important part of a generic resource is the information itself, not any particular
realization of the information. For example, a resource like 'the weather report for
Los Angeles' is a generic resource, as is the text of Moby Dick in any language.
However, the 'weather report for Los Angeles today' is not a generic resource as
it is indexed to a particular temporal junction, nor is Moby Dick in a particular
language like English. Resources may also vary over time. For example, the text of
Moby Dick will be the same over time and so be
time-invariant
, but the resource
for the 'weather report for Los Angeles' will change over time and so be
time-
specific
(Berners-Lee 1996a). Furthermore, resources may vary over media-types.
For example, the same information may be given in some custom XML dialect
or RDF or the same depiction may be given in different formats like JPG and
SVG. These resources are all imported from Berners-Lee's
ont
ontology.
12
There
are also
fixed resources
that regardless of aspects like time and natural language
always return the same representation. For example, a resource for Moby Dick that
always provided the same edition in the same language as plain text would be a
fixed resource. The idea of a fixed resource is surprisingly common, as it equates a
single web-page with a resource and so matches the folk psychology of most users
of the Web.
ont:TimeSpecificResource
: An OWL Class. A resource of which all
representations are in the same version. Representations of the resource will not
change as a result of the resource being updated to a version with time. The dates
of creation and of last modification of such a resource would be expected to be
the same.
-
rdfs:subClassOf InformationResource
-
owl:disjointWith ont:TimeGenericResource
-
ir:realizedBy only (WebRepresentation
∧
(comp:hasComponent exactly 1 CreationDate)
∧
(comp:hasComponent exactly 1 LastModificationDate))
ont:LanguageSpecificResource
: An OWL Class. A resource of which
all representations are in the same natural language.
-
rdfs:subClassOf InformationResource
-
owl:disjointWith ont:LanguageGenericResource
-
ir:realizedBy only (WebRepresentation
∧
(comp:hasComponent exactly 1 ContentLanguage))
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